IdFilter.java example

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usergrid-master
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.usergrid.corepersistence.pipeline.read.traverse;


import org.apache.usergrid.corepersistence.pipeline.read.AbstractFilter;
import org.apache.usergrid.corepersistence.pipeline.read.FilterResult;
import org.apache.usergrid.persistence.model.entity.Id;

import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;

import rx.Observable;

import java.util.List;


/**
 * This command is a stopgap to make migrating 1.0 code easier.  Once full traversal has been implemented, this should
 * be removed
 */
public class IdFilter extends AbstractFilter<FilterResult<Id>, FilterResult<Id>>{

    @Inject
    public IdFilter() {};



    @Override
    public Observable<FilterResult<Id>> call( final Observable<FilterResult<Id>> filterValueObservable ) {
        //ignore what our input was, and simply emit the id specified
        return filterValueObservable.map( idFilterResult ->  new FilterResult( idFilterResult.getValue(), idFilterResult.getPath() ));

    }
}